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HI DEAR USERS,
I HAVE ANALYSED CIRCLER WATER TANK IN STAAD PRO. I DEFINED TANK WALL AS A PLATE MEMBERS.I WANT TO DESIGN THE WALLS FOR MOMENTS AND SHEAR FORCES...I DONT KNOW WHICH PARAMETERS TO USE FOR DESIGN....EXAMPLE Mx,My,Mxy (local) OR GLOBAL MOMENT, SX,SY,SQX,SQY....PLEASE LET ME TO SELECT WHICH PARAMETERS I NEED TO DESIGN TANK FOR REINFORCEMENT AND TRANSVERS BAR...?
ALSO DONT KNOW HOW TO APPLY EARTHQUAKE FORCES...PLEASE NEED URGENT HELPS
THANK YOU...

Dear Er. Uct ,
To start, do these two :
1) Attached PDF file showing how the Plate & Shell element forces are read, using Plate Theory. Please go thru all 21 pages and understand fully. I copied this from a previous SEFI Post.
2) EXAMPLE--10 (Tank) of STAAD/PRO which is part of 29 solved examples which comes with STAAD/PRO software to illustrate how to use STAAD?PRO . Example --10 ( Tank) has Analysis , Design of Concrete Plate Element Design . I have this example in Kip-Ft. units and with ACI code.

Regards .

Vasudeo Pandya P.E.
Structural Engineer

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Dear Sir,
Please note that in circular tank, axial hoop stress will be predominant compared to bending stress. Please check if this is considered by staad or not. You can make use of the tables in IS3370 to calculate the forces and moments in the tank.

What are the load combinations to be considered in designing a RCC water tank capacity 50KL which is resting its base slab on the base of roof slab.Whether it is neccesary to proceed with RCC side wall or will brick masonry can sustain loads?_________________Swaran

Are you supporting the water tank directly on the roof slab ? That will in total exert 50MT (50kL) load on the slab. Is the roof slab designed for the same ? Further, leakage of the slab is also possible, if not waterproofed properly. The usual practice is to raise the columns and provide the roof top tank slightly elevated from the roof slab. For small size tanks of shallow depth, it may be possible to provide brick masonry side walls, properly waterproofed. The side walls may in that case be checked for stresses, especially tensile stress, which the masonry is weak in. You may please post a detailed sketch of the arrangement of the tank, for the sake of clarity.

Please note that in circular tank, axial hoop stress will be predominant compared to bending stress. Please check if this is considered by staad or not.

Dear Arun Kumar Sir,

Provided that the modelling, boundary conditions and loading are correctly applied, any FE code ought to give reasonable values for the forces in the structure. Hence, hoop forces ought to be seen to dominate in a circular tank modelled properly in STAAD.

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